JPH0270036A - Wear-resistant aluminum alloy material - Google Patents

Abstract

PURPOSE:To prevent the seizure of the title aluminum alloy material under severe dry conditions by regulating the maximum Si grain diameter to a prescribed value or below and dispersing specific amounts of lubricating components in an Al-Si alloy material having a specific composition. CONSTITUTION:A wear-resistant Al alloy material has a composition consisting of, by weight, 5-35% Si, 0.5-10% Cu, 0.2-5% Mg, <=10%, in total, of one or more kinds among 0.1.5% W, 0.1-8% CO, and 0.1-5% Ce, and the balance Al. Further, the maximum Si grain diameter is regulated to <=20mum. As lubricating components, 2-20vol.%, in total, of one or more kinds among Pb, Sn, ln, Bi, Sb, C, MoS2, WS2; CaF2, BaF2, and LiF are uniformly dispersed into the above alloy matrix. Moreover, if necessary, <=10%, in total, of one or more kinds among 0.1-8% Fe, 0.3-8% Ni, 0.1-5% Cr, 0.2-5% Mn, 0.1-5% Zr, 0.1-5% V, and 0.1-5% Ti are incorporated. This wear-resistant Al alloy material has superior self-lubricity and produces the effect of lightening the weight of sliding member for internal combustion engine, etc.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a wear-resistant aluminum alloy material, and more particularly to a wear-resistant aluminum alloy material with excellent self-lubricating properties suitable for sliding members of internal combustion engines, etc. .

(Prior art) Internal combustion engine cylinder flock, cylinder liner,
Materials for pistons, rocker arms, etc., compressor vanes, VTR cylinders, etc. are used in sliding parts. As a member, Fe
Aluminum alloys or Cu alloys have been used, but in recent years, aluminum alloys have been used as materials for reasons such as weight reduction, thermal conductivity, corrosion resistance, and cost of sliding members. Examples of wear-resistant aluminum alloys include Al-Si alloys or representative thereof.

(Invention or problem to be solved) However, this type A! When Q-Si alloy materials are manufactured using conventional melting and casting methods, wear resistance improves as the amount of Si added increases, or as the amount of Si added increases, the wear resistance increases.
Due to the coarsening of the particles, the strength, elongation, and toughness of the cap were significantly lowered, and the processability was also lowered.

- On the other hand, is there any improvement by uniformly dispersing hard particles such as Si using powder metallurgy D?The problem is that sintering occurs under harsh dry conditions where lubricating oil cannot be used. There was.

Therefore, one object of the present invention is to provide a wear-resistant aluminum alloy phase which has excellent machinability and self-lubricating properties that do not cause seizure even under severe dry conditions.

(Means for Solving the Problems) The inventors of the present invention have conducted extensive research to solve the problems described below, and as a result, A-I-S containing a predetermined amount of a predetermined element.
Maximum S
It has been found that the objective can be achieved by uniformly dispersing a predetermined amount of a solid lubricant in an alloy matrix (base material) having a particle size of 20 pm or less. The present invention was completed based on this knowledge.

That is, the present invention provides (1) 5 to 35% by weight of Si (hereinafter simply referred to as %), 0.5 to 10% of Cu, and 0.2 to 35% of Mg.
Contains 5%, W0.1~5%, Co011~8%, Ce
Total amount of one or more types from 0.1 to 5% is 10
%, and the maximum Si particle size is 20 gm.
PB, Sn, In, Bi, Sb, C, MoS2 as lubricating components in the matrix of the A-8I alloy
．． WS2, CaF, BaF2. One or more types of LiF1. A wear-resistant aluminum alloy material (hereinafter referred to as the first invention) characterized by containing a total amount of 2 to 20% by volume, and (2) 5 to 35% of Si, 1% of Cu [1,5 to 1% of Il,
Contains Mg0.2-5%, W0. ]~5%, Co0. ]
~8%, Ce[], one or more of I~5% and Fe[], ]-8%, Nj 0.3~8%,
Cr0.1-5%, Mn 0.2-5%, Zr0.1
~5%, V [], 1 of 11~5% Ti0.1~5%
Al-S containing a species or two or more species in an amount not exceeding 10% in total and having a maximum Si particle size of 20 gm or less
PB and S as lubricating components in the helix of the i-based alloy.
n, I n, B 1. Sb, C, MoS, WS2,
CaF, BaF2. The object of the present invention is to provide a wear-resistant aluminum alloy material (hereinafter referred to as the second invention) characterized in that it contains one or more of LiF-14 in a total amount of 2 to 20% by mass.

The effects and contents of the elements contained in the wear-resistant aluminum alloy of the present invention (referring to the first invention and the second invention; the same shall apply hereinafter) and the reasons for limiting the maximum particle size of 81 are as follows. .

The Si content is 5 to 35%. Sl is uniformly dispersed in the structure as hard particles by the rapid solidification method and improves wear resistance. If the Si content is less than 5%, the amount of Si particles is small and it is not clear whether the wear resistance effect is 1".Is the Si content 35
%, the primary Si becomes coarse and the toughness and cutting workability deteriorate.
■Causes deterioration of duality.

The Cu content is 0.5 to 10%. Cu is dissolved in Al and coexists with Mg to precipitate with aging, increasing the strength at room temperature and high temperature, and roughly improving the wear resistance.
do. If the Cu content is less than 0.5%, the effect is insufficient. When the Cu content exceeds 10%, the effect becomes saturated and the corrosion resistance decreases.

Mg content shall be 0.2-5%. Mg forms a solid solution in Al and coexists with Cu, thereby precipitating during aging, increasing the strength at room temperature and high temperature, and further contributing to improving wear resistance by 1 m. If the Mg content is less than 0.2%, the effect is insufficient. If the Mg content exceeds 5%, the ductility of the material decreases and the workability deteriorates.

W content is 0.1 to 5%, Ce content is 0.1 to 8%,
Ce content shall be 0.1 to 5%.

W, Co, and Ce are dispersed in the matrix as fine compounds and have the effect of increasing the strength of the matrix. The effect is insufficient when the respective contents are at or below their lower limits. If each content exceeds its upper limit, the effect will be saturated and the compound will become coarser, resulting in a decrease in toughness.

In the second invention, the Fe content is 0.1 to 8%, the N content is 0.3 to 8%, the Cr content is o, i to 5%, the Mn content is 0.2 to 5%, and the Zr content is 0.1 to 8%. The content is 0.1 to 5%, the content is 0.1 to 5%, and the Ti content is 0.1 to 5%.

The elements Fe, Ni, Cr, Mn, Zr, ■, and Ti all have the effect of increasing the strength of the matrix, and also have the function of improving its wear resistance. If the content of each of these elements is less than its lower limit, the effect will be insufficient. Moreover, if the content exceeds the respective upper limit, the effect will be saturated.

Further, the total content of other elements other than Si, Cu, and Mg shall not exceed 10%. If the total content exceeds 10%, the effect will be saturated and the weight reduction will be lost.

In addition to the elements listed above, there are no inevitable impurities such as Be, B, Na, and Ca in the wear-resistant aluminum alloy material of the present invention.
．． Even if it is contained in an amount of 5 to 500 ppm, its properties are not affected in any way.

The maximum Si particle diameter in the wear-resistant aluminum alloy material of the present invention is 20 pm or less. If the Si particle size exceeds 20 gm, the machinability will be significantly reduced and the wear of the hide during cutting will increase.

The wear-resistant aluminum alloy material of the present invention has the above composition and S
A with i particle size! ; Pb, Sn, In, Bi, Sb, as lubricating components in the matrix of L-Si alloy;
C,MoS,,WS2. CaF2, BaF2, LIF
Contains one or more types in a total amount of 2 to 20% by volume. These lubricating components exhibit excellent lubricating properties when uniformly dispersed in the matrix. The effect is 2% by volume
If it is less than 20% by volume, it is not sufficient, and if it exceeds 20% by volume, the strength will drop significantly.

Next, a method for manufacturing the wear-resistant aluminum alloy material of the present invention will be explained.

The wear-resistant aluminum alloy material of the present invention can be produced, for example, by pulverizing an Al--Si alloy having the above-mentioned composition, blending a lubricating component into the powder and uniformly dispersing it, and then molding the powder.

A pattern used for manufacturing the aluminum alloy material of the present invention -
Preferably, the Si-based alloy powder is one that is rapidly solidified from a molten metal. The rapidly solidified powder used here may be in the form of flakes, ribbons, or powder, and its manufacturing method may be any of the rotating disk method, the rapid cooling roll method, and the gas atomization method. 102 to uniformly disperse the Si particles and the compound that strengthens the matrix.
A method that can obtain a cooling rate of at least °C/sec is preferred.

In order to uniformly disperse the solid lubricant component in the matrix, it is preferable to thoroughly mix the alloy powder and the lubricant component using an attritor or the like.

When low melting point metals such as Pb and Sn are used as lubricating components, they can be uniformly dispersed by melting them into a molten matrix alloy and forming rapidly solidified powders. Moreover, In, Bi, Sb, C1MoS2. WS2. CaF
2. BaF2. When using powder such as LiF, it is even more preferable to perform a treatment such as surface plating treatment to ensure sufficient adhesion to the matrix alloy.

It is said that the molding process of the alloy powder mixed with the lubricating component is carried out according to the usual aluminum powder metallurgy manufacturing method.

(Example) Next, the present invention will be explained in more detail based on examples.

For example, an aluminum alloy not shown in Table 1 and having a chemical composition of A-'-E was quenched at a rate of 10 to 10'C/sec from a molten alloy by the Ar casing method.
A powder was manufactured as follows. This alloy powder was used as 71 to sox, and the solid lubricants shown in Table 2 were mixed in the respective proportions, thoroughly mixed using an attritor, and then cold compression molded to a diameter of 100 mmφ and a length of 200 mm. A cold-formed product with a ratio of 80% was obtained. After sealing this in an aluminum can of a degassing container, superheating vacuum degassing was performed at 400°C, hot press forming was performed at 400°C to true density, and the degassing container was externally cut and removed. One billet with 80mmφ and 150mm length. Further, hot extrusion was carried out at 400°C to produce an extruded rod with a diameter of 30 mmφ, which was prepared as Invention Alloy Material Sample No.

1 to 11 O.

Next, an aluminum alloy having chemical compositions F and G not shown in Table 1 was mold-cast at a cooling rate of 208 C/sec and cut to produce billets 1~ with a diameter of 80 mmφ and a length of 1.50 mm. extruded for 30 m at 400°C
mφ extruded rod, comparative example alloy phase sample No. 11.12
I got it.

Maximum S for the obtained aluminum alloy material extrusion cup sample
i particle diameter was measured using an optical microscope. In addition, a wear test using an Okoshi type abrasion tester and a bottle-disk type follow-up test were carried out to determine the surface pressure of the C-fired work piece (M2O). In addition, a cutting test was conducted using a lathe to evaluate the T properties before cutting. These results are shown in Table p53.

As is clear from the results in Table 3, all of the alloy materials of the present invention (sample Nos. 1 to 10) have low specific wear and excellent wear resistance, and have high resistance to surface pressure when scorching occurs. Excellent seizability and machinability.

(Effects of the Invention) According to the present invention, an aluminum alloy material having excellent cutting workability, seizure resistance, and wear resistance can be obtained. In this way, the wear-resistant aluminum alloy material of the present invention has excellent wear resistance with self-lubricating properties that do not cause seizure even under harsh dry conditions, and is particularly useful for reducing the weight of sliding parts such as white-burning engines. be effective.

Claims (2)

[Claims] (1) Si5-35%, Cu0.5-10%, Mg0.
Contains 2-5%, W0.1-5%, Co0.1-8%,
Contains one or more of Ce0.1 to 5% in a total amount not exceeding 10% (or more by weight), and has a maximum S
Pb, Sn, In, Bi,
Sb, C, MoS_2WS_2, CaF_2, BaF_
2. One or more types of LiF in a total amount of 2 to 2
A wear-resistant aluminum alloy material characterized by containing 0% by volume. (2) Si5-35%, Cu0.5-10%, Mg0.
Contains 2-5%, W0.1-5%, Co0.1-8%,
One or more of Ce0.1-5% and Fe
0.1-8%, Ni0.3-8%, Cr0.1-5%,
Mn0.2-5%, Zr0.1-5%, V0.1-5%
, a matrix of an Al-Si alloy containing one or more of Ti0.1 to 5% in a total amount not exceeding 10% (or more by weight) and having a maximum Si particle size of 20 μm or less Pb, Sn, In, Bi as lubricating components
, Sb, C, MoS_2, WS_2, CaF_2, Ba
The total amount of one or more of F_2 and LiF is 2
A wear-resistant aluminum alloy material characterized by containing ~20% by volume.